Twin-Fin Surfing, Early '80sCredits: Jack McCoy, Dick Hoole, Chris Bystrom, Alan Rich, Scott Dittrich, Hal JepsenEncyclopedia of Surfingtwin-finRichards, MarkKealoha, DaneCurren, TomMungall, GregHistory of SurfingTwo Fins, More WinsMark Richards, Gentleman KillerInterviewsMark Richards (1978)FeaturesTWIN-FINS: YOU SPIN ME RIGHT ROUNDMARK RICHARDS: "NOT PRETTY, BUT PLENTY RADICAL"The Sunday JointSUNDAY JOINT, 8-12-2018: MARK RICHARDS AND THE TWIN-FINVideosCorky Carroll, 1970 Twin-Fin Session, Cottons PointFaster Twin-Fin! Kill! Kill!Twin-Fin Surfing, 1970Greg MungallDane KealohaMore